[Had he mentioned it, Sibyll may have gone along with the idea. But for now she's just upset that not only has she somehow been kidnapped, her kidnappers felt the need to take her measurements while they were at it.]

They could have just left a sign on the door.

[She abandons the room in favor of an earlier one she had explored. There had been clothes also in those drawers, but they weren't hers. Any complaints from the actual owners would be ignored.]

What made you pick out a roommate? You never struck me as the sort.